JP2007111790A - Bit holder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To use a bit holder for not only inch bit and single-head bit but also a double ended bit. <P>SOLUTION: This bit holder has: a shank part 2; a holder main body 3 connected and fixed to the distal end; an operating sleeve 4 externally fitted to be slidable around the holder main body 3; and a self recovery means 5 elastically energizing positioning of the operating sleeve 4 from a post-operation position toward an pre-operation position. A bit insertion port 7 is provided at a distal end part of the holder main body 3. A plurality of axial direction engagement means 6 are provided between a peripheral wall of the bit insertion port 7 in the holder main body 3 and an inner peripheral surface of the operating sleeve 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a bit holder for enabling various bits to be mounted on a rotary drive tool such as an electric screwdriver.

A bit holder for enabling various bits such as a driver bit and a hexagon wrench bit to be mounted on a rotary drive tool such as an electric screwdriver is known (see, for example, Patent Documents 1 and 2). This type of bit holder has a shank portion that is gripped by a rotary drive tool and a holder body that is connected and fixed to the tip of the shank portion, and the bit is prevented from rotating around the axis at the tip of the holder body. A bit insertion opening (opening shape is a regular hexagon, etc.) is provided so that it can be held as it is.
Inside this bit insertion slot, a magnet is provided on the back side, and a locking tool (ring, pin, etc.) is provided in the vicinity of the entrance. The bit reaching the back side is adsorbed by the magnet, and the back side. Bits that do not reach the end have been prevented from coming out of the respective bit insertion openings by engaging a locking tool with small notches provided on the outer peripheral surface thereof.

  By the way, as shown in FIGS. 8A, 8B, and 8C, recent bits can be roughly classified into three types. The bit 100 shown in FIG. 8A is a type in which a working tip 101 is provided at both ends (this type is referred to as “double-ended bit” in this specification), and the bit 102 shown in FIG. This is a type in which the tip 103 is provided only at one end (this type is referred to as “one-headed bit” in this specification). In the double-ended bit 100, a constricted portion 105 is provided in the vicinity of each working tip 101, and in the single-ended bit 102, a constricted portion 107 is provided in the vicinity of the rear end 106 on the side opposite to the working leading end 103 (particularly, the single-ended bit 102 has It is called “stepped type” because of the shape behind the constricted portion 107).

On the other hand, the bit 109 shown in FIG. 8C has a shaft diameter of the working front end 110 of inch specifications, but the rear end 111 side opposite to the working front end 110 is used for a bit holder. It is a type formed in a different size (this type is referred to as “inch bit” in this specification). In the inch bit 109, a plurality of V-notch notches 112 are provided on the outer peripheral surface on the side to be held by the bit holder so as to be scattered around the periphery. Many of the old bits were mostly provided with this notch 112.
Note that any of the above-described types of bits 100, 102, and 109 have various working tips 101, 103, and 110 such as a plus type, a minus type, and a hexagon wrench type, but are omitted in each figure of FIG. It is drawn.

The distance L from the rear end 111 to the notch 112 in the inch bit 109 and the distance M from the rear end 106 to the constricted portion 107 in the one-headed bit 102 are approximated, but compared to these, each working tip in the double-ended bit 100 The distance N from 101 to the constricted portion 105 is clearly longer.
Japanese Utility Model Publication No. 5-5364 Japanese Utility Model Publication No. 5-85560

As described above, since the distance L from the rear end 111 to the notch 112 in the inch bit 109 and the distance M from the rear end 106 to the constricted portion 107 in the single-headed bit 102 are approximate, in the conventional bit holder, It was possible to engage the notch 112 of the inch bit 109 and the constricted portion 107 of the single-headed bit 102 by a locking tool provided near the entrance of the bit insertion opening.
However, with respect to the double-ended bit 100, it has been impossible to engage the constricted portion 105 with the locking tool because the distance N from each working tip 101 to the constricted portion 105 is long. Even if a magnet is provided in the inner part of the bit insertion opening, the work tip 101 may be replaced, and as a result, the conventional bit holder can be used for both the inch bit 109 and the single-ended bit 102. Even if there were, even the double-ended bit 100 could not be combined.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a bit holder that can be used not only for an inch bit and a single-ended bit but also for a double-ended bit.

In order to achieve the above object, the present invention has taken the following measures.
That is, the bit holder according to the present invention slides in the axial direction in a state in which the shank portion to be gripped by the rotary drive tool, the holder main body connected and fixed to the tip of the shank portion, and the outer periphery of the holder main body. The operation sleeve is freely held, and self-returning means for elastically urging the position of the operation sleeve relative to the holder body from the post-operation position to the pre-operation position.
In addition, a bit insertion port is provided at the tip of the holder body so that the bit can be held while being prevented from rotating around the axis, and between the peripheral wall of the bit insertion port and the inner peripheral surface of the operation sleeve in the holder body. An engaging means for switching between engagement and disengagement with respect to the bit fitted to the bit insertion opening by sliding of the operation sleeve is provided. The engaging means is provided at a plurality of positions in the axial direction.

It should be noted that the positions where the engaging means are provided include two positions, a rear position where the inch bit and the single-headed bit are secured and a front position where the double-headed bit is secured.
Because of such a configuration, when the bit types are different, each engagement means is appropriately used, so that it can be used not only for the inch bit and the single-ended bit but also for the double-ended bit.
The engaging means includes a tip hole penetrating the peripheral wall of the bit insertion port in the holder main body in the radial direction of the bit insertion port, and a movably fitted to the tip hole in the penetrating direction. When the tip does not bulge from the engagement tip formed so as to bulge at the same time and the bit insertion port side hole in the tip hole, the tip protrudes from the hole on the operation sleeve side in the tip hole. What is necessary is just to have the chip-retreating recessed part provided in the inner peripheral surface of the operation sleeve by the magnitude | size which can absorb a part.

The engaging tip is, for example, a ball, and it can be said that such engaging means constitutes a so-called ball push mechanism. By adopting this mechanism, the structure can be simplified. Moreover, it is not necessary to use a magnet by adopting this mechanism. Considering the use at the work site where chips of magnetic material are scattered, the magnetic material is inserted into the bit insertion hole of the holder body or between the outer peripheral surface of the holder body and the inner peripheral surface of the operation sleeve. It can be said that it is beneficial in that it can prevent the difficulty of being clogged with chips.
The operation sleeve has a moving ring that is slidable in the axial direction along the outer peripheral surface of the holder body, and the tip-recessing recess of the engaging means provided at the rear position is on the inner peripheral surface of the moving ring. The self-returning means is formed with a resilient force between the central portion of the holder body in the axial direction and the rear surface of the moving ring, thereby applying a resilient force to the operating sleeve via the moving ring. Operate by generating a resilient force between the rear end of the holder body and the axial center of the operation sleeve, which is located behind the front resilient part for applying force and the front resilient part. A rear elastic portion that applies a forward elastic biasing force to the sleeve may be provided.

  The bit holder according to the present invention can be used not only for the inch bit and the single-ended bit but also for the double-ended bit.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 7 show an embodiment of a bit holder 1 according to the present invention. As shown in FIGS. 1 and 2, the bit holder 1 has a shank portion 2, a holder body 3, and an operation sleeve 4, and is assembled between the holder body 3 and the operation sleeve 4. The self-returning means 5 and the engaging means 6 are provided.
The shank portion 2 is to be gripped by a rotary drive tool (not shown) such as an electric screwdriver, and is a rod-like portion formed with various cross-sectional shapes that are chamfered to prevent rotation, such as a regular hexagon. It is.

  When the holder body 3 is connected and fixed to the tip of the shank portion 2, it is formed in a cylindrical shape that is slightly thicker than the shank portion 2, and a bit (see FIG. 8) is held at its tip while being prevented from rotating around the axis. A bit insertion slot 7 is provided which enables it. The connection between the holder main body 3 and the shank portion 2 may be a screw connection type, a press-fitting type, or a weld stop. Further, the holder main body 3 and the shank portion 2 may be integrally formed in a stepped bar shape. The bit insertion port 7 is formed in a hexagonal shape or the like according to the cross-sectional shape of the bit so that the bit can be held in a non-rotating state.

An outer flange portion 10 is formed on the outer peripheral surface of the holder body 3 so as to project radially outward over the entire circumference in the axial center portion. Further, on the front side of the outer flange portion 10, a stopper step portion 11 formed by reducing the outer diameter on the front end side by one step is provided at an intermediate position between the distal end position of the holder body 3 and the outer flange portion 10. ing.
The operation sleeve 4 is formed in a cylindrical shape so that it can be fitted around the holder body 3, and is slidable in the axial direction of the holder body 3 in this fitted state. Note that a plurality of annular irregularities are provided on the outer peripheral surface of the operation sleeve 4 in order to enhance the ease of operation (non-slip).

The inner diameter of the operation sleeve 4 is formed so as to accommodate the outer flange portion 10 provided on the holder body 3. That is, the inner diameter of the operation sleeve 4 is formed to be slightly larger than the outer diameter of the holder body 3 other than the outer flange portion 10. Therefore, when the operation sleeve 4 is externally fitted to the holder main body 3, a circumferential gap is formed between the outer peripheral surface of the holder main body 3 and the inner peripheral surface of the operation sleeve 4.
As shown in an enlarged view in FIG. 3, the inner diameter on the distal end side of the operation sleeve 4 is reduced in diameter, and is substantially the same as the outer diameter of the holder body 3 in front of the stopper step portion 11. Therefore, the stepped portion 12 and the slide guide surface 13 extending forward are formed by the reduced diameter portion.

The operation sleeve 4 is provided with a moving ring 14 formed of a separate member. When the moving ring 14 comes into contact with the front step portion 12, further forward movement is restricted. Yes. The moving ring 14 is slidable in the axial direction along the outer peripheral surface in front of the stopper step portion 11 provided in the holder main body 3. Back movement is restricted.
The self-returning means 5 urges the positioning of the operation sleeve 4 with respect to the holder body 3 from the post-operation position to the pre-operation position. In the present embodiment, the self-return means 5 and the rear And an emitting portion 18.

The front impact portion 17 is provided on the front side of the outer flange portion 10 provided at the center portion in the axial direction of the holder body 3, and is moved from the front surface of the outer flange portion 10. A coil spring is provided between the rear surface of the ring 14 so as to be fitted around the holder body 3. In other words, the moving ring 14 is pressed against the front step portion 12 of the operating sleeve 4 by the elastic force generated by the front elastic portion 17 so that a forward elastic biasing force is applied to the operating sleeve 4. It has become.
In addition, a C-shaped retaining ring 20 is fitted into the inner peripheral surface of the operation sleeve 4 at the center portion in the axial direction, thereby forming an inner flange portion 21. The inner flange portion 21 comes into contact with the rear surface of the outer flange portion 10 of the holder body 3 when the operation sleeve 4 is biased forward by the action of the front elastic portion 17. This also has the effect of limiting the forward stroke of the operating sleeve 4.

On the other hand, the rear impact portion 18 is provided on the rear side of the front impact portion 17 and is provided at the rear end portion 3a of the holder body 3 and the central portion in the axial direction of the operation sleeve 4. A coil spring is interposed between the inner flange portion 21 and the holder main body 3 so as to be fitted around the holder main body 3.
A C-shaped shaft retaining ring 23 is fitted around the outer periphery of the rear end 3 a of the holder body 3, and a stopper ring 24 is fitted on the front side of the C-shaped shaft retaining ring 23. The rear impact portion 18 is interposed between the rear surface of the inner flange portion 21 provided on the operation sleeve 4 and the front surface of the stopper ring 24 provided on the holder body 3. The stopper ring 24 is pressed against the C-shaped shaft retaining ring 23 by the elastic force generated by the rear elastic portion 18 so that a forward elastic biasing force is applied to the operation sleeve 4 as the reaction force. It has become.

The engaging means 6 is provided between both the peripheral wall of the bit insertion port 7 and the inner peripheral surface of the operation sleeve 4 in the holder main body 3, and is provided at a plurality of positions (main In the embodiment, it is provided at two positions (front and rear). Any of these engaging means 6 is formed having a tip hole 25, an engaging tip 26, and a tip retracting recess 27.
The tip hole 25 is formed by penetrating the peripheral wall of the bit insertion port 7 in the holder body 3 in the radial direction of the bit insertion port 7. In the tip hole 25, a narrowing edge 25 a (shown only in FIG. 3) is provided on the opening peripheral portion on the bit insertion opening 7 side so as to project to the inner peripheral side of the tip hole 25.

The engaging tip 26 is fitted to the tip hole 25 so as to be movable in the penetrating direction, and is formed in a size that bulges simultaneously from the hole openings on both sides of the tip hole 25. In this embodiment, it is a ball (steel ball). The engaging tip 26 bulges from the tip hole 25 to the bit insertion port 7 side of the holder body 3, but is not allowed to pass through the diaphragm edge 25 a provided in the tip hole 25. There is no escape into the mouth 7.
The tip retracting recess 27 is an amount that bulges from the hole on the operation sleeve 4 side in the tip hole 25 when the engagement tip 26 is not bulged from the hole on the bit insertion port 7 side in the tip hole 25. Is recessed in the inner peripheral surface of the operation sleeve 4. Note that the tip retracting recess 27 of the engaging means 6 provided at the front position is formed with respect to the inner peripheral surface of the slide guide surface 13, and the tip retracting recess 27 of the engaging means 6 provided at the rear position is provided. Is formed with respect to the inner peripheral surface of the moving ring 14.

FIG. 2 shows a situation before the operation sleeve 4 is operated, and FIG. 4 shows a situation after the operation sleeve 4 is operated. As is apparent from the comparison between these drawings, in a state before the operation sleeve 4 is operated (FIG. 2), the moving ring 14 contacts the front step portion 12 in the operation sleeve 4 and the inner flange portion of the operation sleeve 4 21 is in contact with the outer flange portion 10 of the holder body 3.
At this time, the front elastic part 17 and the rear elastic part 18 of the self-returning means 5 are both in the state where the elastic force is most relaxed (the coil spring is extended) within a limited range, The operation sleeve 4 is urged against the holder body 3 so as to push it forward.

Then, in the engagement means 6 at the front position, the engagement chip 26 is pushed by the slide guide surface 13 of the operation sleeve 4 so as to bulge into the bit insertion port 7 of the holder body 3, and the engagement means at the rear position. 6, the engaging tip 26 is pushed by the moving ring 14, and swells into the bit insertion port 7 of the holder body 3. In such a situation, the situation where any one of the engagement tips 26 bulges into the bit insertion slot 7 corresponds to the engagement state with respect to the bit (see FIG. 8) fitted in the bit insertion slot 7.
When the operation sleeve 4 is operated from this state and the holder body 3 is slid rearward (FIG. 4), both the front bullet portion 17 and the rear bullet portion 18 of the self-returning means 5 exert their elasticity. Become stronger.

  Then, in the engagement means 6 at the front position, the engagement chip 26 can be fitted into the chip retracting recess 27 provided on the slide guide surface 13 of the operation sleeve 4. Similarly, the engagement means 6 at the rear position is engaged. The chip 26 can be fitted into the chip-retreating recess 27 provided in the moving ring 14. That is, when the engagement tips 26 are pushed from the inside of the bit insertion opening 7 of the holder body 3, these engagement tips 26 move to the tip retracting recess 27 side and are expelled from the inside of the bit insertion opening 7. Under such circumstances, the situation in which both engaging tips 26 are pushed out of the bit insertion slot 7 and fitted into the chip-recessing recess 27 is the engagement with the bit fitted in the bit insertion slot 7 (see FIG. 8). Corresponds to the release state.

When using the bit holder 1 of the present invention having the configuration described in detail above, first, as shown in FIG. 4, the operating sleeve 4 is slid to the rear position, and then the bit is inserted into the bit insertion port 7 of the holder body 3. And release the hand from the operation sleeve 4. Then, the operation sleeve 4 tries to move forward by the action of the self-return means 5.
When the bit is the double-ended bit 100 as shown in FIG. 5, the engagement tip 26 abuts against the side surface of the double-ended bit 100 (the portion without the recessed portion 105) in the engagement means 6 at the rear position. The tip 26 is ejected from the bit insertion opening 7 and fits into the tip retracting recess 27, and the moving ring 14 is prevented from moving forward.

However, in the engagement means 6 at the front position, the engagement tip 26 is engaged with the recess 105 of the double-ended bit 100, and the engagement tip 26 is backed up on the slide guide surface 13. Therefore, the double-ended bit 100 is thereby removed from the bit insertion port 7.
On the other hand, when the bit is a single-ended bit 102 as shown in FIG. 6, the engaging tip 26 abuts on the side surface of the single-ended bit 102 (the portion without the recessed portion 107) in the engaging means 6 at the front position. 7, and is fitted into the chip retracting recess 27 on the slide guide surface 13 side. However, the engagement means 6 in the rear position can be engaged with the recess 107 of the one-sided bit 102. Since the engagement tip 26 is backed up by the moving ring 14, the one-headed bit 102 is thereby removed from the bit insertion opening 7.

  The same applies to the case where the bit is an inch bit 109 as shown in FIG. 7, and in the engagement means 6 at the front position, the engagement tip 26 abuts against the side surface of the inch bit 109 (the portion without the notch 112) to insert the bit. Although it is driven out of the opening 7 and fits into the chip-recessing recess 27 on the slide guide surface 13 side, the engagement chip 26 is engaged with the notch 112 of the inch bit 109 in the engagement means 6 at the rear position. Since the engagement tip 26 is backed up by the moving ring 14, the inch bit 109 is thereby removed from the bit insertion port 7.

As a result, the bit holder 1 can be used not only for the single-ended bit 102 and the inch bit 109 but also for the double-ended bit 100.
By the way, this invention is not limited to the said embodiment, It can change suitably according to embodiment.

It is a partially broken perspective view showing one embodiment of a bit holder concerning the present invention. It is the sectional side view which showed the bit holder of FIG. FIG. 3 is an enlarged side cross-sectional view of a part of FIG. 2 (a tip portion of a bit holder). FIG. 2 is an operation explanatory view showing a state in which a sleeve 4 is idled from the state of FIG. 1. It is the sectional side view which showed the state which hold | maintained the double-ended bit in the bit holder of FIG. It is the sectional side view which showed the state which hold | maintained the single-headed bit in the bit holder of FIG. FIG. 2 is a side sectional view showing a state in which an inch bit is held in the bit holder of FIG. 1. It is the side view which showed the kind of bit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bit holder 2 Shank part 3 Holder main body 3a Rear end part of holder main body 4 Operation sleeve 5 Self-restoring means 6 Engaging means 7 Bit insertion port 14 Moving ring 17 Front elastic part 18 Rear elastic part 25 Tip hole 26 Engagement Combined chip 27 Chip retracting recess 100 Double-ended bit 102 Single-ended bit 109 Inch bit

Claims (4)

A shank portion (2) to be gripped by the rotary drive tool;
A holder body (3) connected and fixed to the tip of the shank (2);
An operation sleeve (4) held slidably in the axial direction in a state of being fitted around the holder body (3);
Self-returning means (5) for resiliently urging the positioning of the operation sleeve (4) relative to the holder body (3) from the post-operation position to the pre-operation position;
The tip of the holder body (3) is provided with a bit insertion port (7) that allows the bit to be held while being rotated around the axis,
The holder main body (3) was fitted into the bit insertion port (7) by sliding the operation sleeve (4) between the peripheral wall of the bit insertion port (7) and the inner peripheral surface of the operation sleeve (4). Engagement means (6) for switching between engagement and disengagement with respect to the bit is provided,
A bit holder, wherein the engaging means (6) are provided at a plurality of positions in the axial direction.   The position where the engaging means (6) is provided includes two positions: a rear position where the inch bit (109) and the one-headed bit (102) are secured, and a front position where the double-headed bit (100) is secured. The bit holder according to claim 1, wherein the bit holder is provided. The engaging means (6)
A tip hole (25) penetrating the peripheral wall of the bit insertion slot (7) in the holder body (3) in the radial direction of the bit insertion slot (7);
An engagement tip (26) that is movably fitted in the tip hole (25) in the penetrating direction and is sized to bulge out from the hole openings on both sides;
From the hole on the operation sleeve (4) side in the tip hole (25) when the engagement tip (26) is not expanded from the hole on the bit insertion opening (7) side in the tip hole (25). A chip retracting recess (27) recessed in the inner peripheral surface of the operation sleeve (4) with a size capable of absorbing the bulging portion;
The bit holder according to claim 2, further comprising: The operation sleeve (4) has a moving ring (14) that is slidable in the axial direction along the outer peripheral surface of the holder body (3).
Of the engaging means (6), the tip retracting recess (27) provided at the rear position is formed on the inner peripheral surface of the moving ring (14),
The self-return means (5)
By generating a resilient force between the axial center of the holder body (3) and the rear surface of the moving ring (14), the operating sleeve (4) is elastically attached to the operating sleeve (4) through the moving ring (14). A front bullet portion (17) for applying a force,
A resilient force is generated between the rear end portion (3a) of the holder body (3) and the axially central portion of the operation sleeve (4) on the rear side of the front resilient portion (17). A rear elastic portion (18) by applying a forward elastic biasing force to the operation sleeve (4);
The bit holder according to claim 3, comprising:

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